Distance is a numerical description of how far apart objects are. In physics or everyday usage, distance may refer to a physical length, or an estimation based on other criteria. In most cases, "distance from A to B" is interchangeable with "distance between B and A".

The distance between (x1, y1) and (x2, y2) is given by:

d=sqrt((x2-x1)² + (y2-y1)²)

Source: Wikipedia (license)

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